Iowa Code § 420.239: Certificate of redemption.

The treasurer, collector, or person authorized to receive the same, upon application of any party to redeem real property sold as aforesaid, and being satisfied that such person has a right to redeem the same, and on payment of the proper amount, shall issue to such party a certificate of redemption, in substance and form as provided for the redemption of property sold for state and county taxes, which redemption shall thereupon be deemed complete without further proceedings.